As mention already, but it probably should be reinforced. Vcoins.com is your best bet for coin purchases. This site is community of dealers across the world that share a passion for numismatics. The dealers are also held to high standards. Vcoins also host articles, their own Vauction and other tools and references.

if you are YN use the Ancient Coin Project.

I believe coins also has a forum

@mrbrklyn
I believe vcoins also has a forum